Re: [Lcms-user] vgct tags

[Marti <ma...@li...>]

Hi,

>  I looked at the LCMS docs and it has nothing about vgct tags 

lcms does currently NOT implement it because it is not on ICC spec. 

Alas, I'm a bit critical on such practices. Using this kind of stuff will
make profiles "active" in the sense they are no longer a characterization
of the hardware but a way to set specific configurations. I have seen many times
desktops completely ruined by different software,  each one trying to load
its own vgct profile. Also, this is hardly non-portable and very hardware 
specific.

The whole point of this tag is specify a set of curves for loading the hardware
gamma ramp. But this puts hardware in "half way" since primaries are not modified
at all, so the CMM has still some work to do. At that point I think this is useless, 
since non-color managed apps will continue displaying wrong colors and 
color-managed ones will continue processing the raster data. Exactly the same 
amount of work that doing all conversion, including gamma ramp. Some people 
would argue its is better half color management that nothing at all, but at that 
point the topic is no longer on color management, so let's forgot the whole stuff.


I have added the tag signature in lcms.h, but quite probably this is all the support
1.15 will include.

Regards
--
Marti Maria
The littlecms project.
www.littlecms.com

----- Original Message ----- 
From: "Hal V. Engel" <hv...@as...>
To: <lcm...@li...>
Sent: Sunday, October 09, 2005 10:09 PM
Subject: [Lcms-user] vgct tags


>I would like to setup LPROF so that it will create vgct tabs in monitor 
> profiles.   I looked at the LCMS docs and it has nothing about vgct tags 
> there so I am not sure where to begin.   Does anyone here know anything about 
> this?  If so could you point me to sources of information about this to help 
> me get started?
> 
> Thanks,
> 
> Hal  
> 
> 
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